When you import an image into DVD Lab Pro to use as a menu, how does it scale the image for NTSC 16:9 i.e. what resolution does the program want to make it? Usually I make images for NTSC Widescreen 856x480. JPEGs and the like seem to display fine at this resolution in DVD Lab Pro; however, when I import a PSD, DVD Lab Pro tells me that 16:9 should be 960x540 and 4:3 should be 720x540. Why? What's the logic behind these values? I have never heard them used in connection with DVD before and don't see what the significance of these numbers is.